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Re: (OT) Storage (8*IDE HDs) any experiences? +55v


yes gnd should be connected...

if +5v, +3.3v is NOT connected together...
and assuming you have 2 powersupplies..

and if the power supply to the disk dies...
    than you're out of luck
	or if the powersupply tot eh motherboard dies...
 	you'd be out of luck too

in which case...whats thepoint of having 2 PS ???
	- if it cannot handle the load...get a bigger power supply

	- having 2 power supplies complicates things..
	and some devices running at 12.5v and others at 11.5v..
	at the extreme voltage ranges ... similarly for +5v range
	and +3.3 ranges...( all kinds of possible random timing problems?? 

if you do have 2 power supplies.. you should invest in a 
properly designed load-sharing power circuitry such that the other
supply can drive all devices it needs by itself...
	- or just get a powersupply with 2x the capacity too
	does almost the same trick..

	- except if the one supply dies...you're dead...

some ( supermicro ) motherboards has dual atx connectors
...but the disks are not yet dual-power supplied... :-(

and we wont even talk about the UPS triggering a shutdown in
these cases... what a mess... but fun !!!

c ya
http://www.Linux-Sec.net ... 

On Wed, 2 May 2001, Hamish Moffatt wrote:

> On Tue, May 01, 2001 at 07:46:42PM +1000, Hamish Moffatt wrote:
> > On Tue, May 01, 2001 at 11:03:06AM +0200, Russell Coker wrote:
> > > On Monday 30 April 2001 00:04, Hamish Moffatt wrote:
> > > > I don't see why. Nor is this any different to any external drives.
> > > > You have a hefty ground connection between the power supplies anyway
> > > > (the mains, plus the metal case acting as ground).
> > > 
> > > External drives generally don't use an ATA interface!  I am not confidant of 
> > > the main earth acting as a suitable earth for the DC power.
> > 
> > True, but I don't see this as a big issue.
> You could connect the DC grounds of the two supplies together safely.
> Don't connect any other rails together though.
> Hamish
> -- 
> Hamish Moffatt VK3SB <hamish@debian.org> <hamish@cloud.net.au>
> -- 
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